Fenwick Tree Tutorial | Foolw-up problem from Codeforces | Check first comment before starting

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---------------------------------------------------------------------------------------------------------------------------------------------------- In this video, I have explained the Data Structure Fenwick Tree. The update and query operations have been explained in brief with code explanation.

Reference Blog: https://codeforces.com/blog/entry/61364
Follow up Problem to solve: https://www.youtube.com/watch?v=fgEe-iPdqeI

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Environment Set-up: https://www.youtube.com/watch?v=Fql_b-xZYwQ

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